[BC] KS-20159

Fri Apr 6 11:15:46 CDT 2007

KS-20159 L3 includes the solid state amp 

-----Original Message-----
From: broadcast-bounces at radiolists.net
[mailto:broadcast-bounces at radiolists.net] On Behalf Of Dana Puopolo
Sent: Friday, April 06, 2007 11:01 AM
To: Broadcasters' Mailing List
Subject: [BC] KS-20159

OOPS!
I got it turned around.
It was a KS-20159. here were also L1,L2 and L3 versions. They also made
a solid state amplifier for them.

------ Original Message ------
Received: Fri, 06 Apr 2007 11:52:47 AM EDT
From: "Dana  Puopolo" <dpuopolo at usa.net>
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
Subject: Re: [BC] Xmitters at aol.com

The companion equalizer was known as a KS-20951.

-D

------ Original Message ------
Received: Fri, 06 Apr 2007 09:39:44 AM EDT
From: RichardBJohnson at comcast.net
To: "Broadcasters' Mailing List" <broadcast at radiolists.net>,
broadcast at radiolists.netCc: RLO2L at aol.com
Subject: Re: [BC] Xmitters at aol.com

The telco 111-C "repeat coils" are available on the surplus market. They
are probably the finest audio-frequency transformers --ever. They have
four shielded coils and the core is a toriod made of mu-metal strip.
Very impressive for something designed in the 1920s. The companion shunt
equalizers are also available although I don't remember the number. They
consist of a tapped inductor and tapped series resistors. Basically, you
shunt-out the low frequencies the same amount as the high frequencies
have been shunted-out by the line capacitance. A one-mile long physical
pair, with no side-legs or stubs can be equalized to over 100 kHz, so
equalizing it to 15 kHz is a no-brainer. You won't need any
amplification, the line-loss after equalization will be less than 10 dB.

You connect your  station's audio feed at the studio to the outgoing
111-C "coil" primary. You make the primary by connecting any two coils
in series.
You connect the other two series-connected coils to the phone line. At
the transmitter, you connect another "coil" the same way. On the telco
side, you connect will your shunt equalizer but don't connect it yet.
Since you probably don't have a helper at the studio, you go to the
studio and send 15 kHz. You go back to the transmitter and measure the
signal, it will probably be about
9
dB below  what you are sending from the studio. Write this down! Then
you go back to the studio and send the exact same level at 100 Hz. Then
you go to the transmitter and connect the equalizer. You leave the
resistor in its default
(mid) position, and you adjust the taps on the inductor to reduce the
100 Hz level to the level of the 15 kHz tone previously measured and
written down.
You should be able to get it within 1 dB.

The result will be an equalized "program channel A," in telco lingo. For
a mile-long line, you will certainly have it equalized well enough for
AM, perhaps even FM. In a previous life I was able to equalize stereo
pairs to 15 kHz, although I needed a Langevin EQ-257-A  equalizer. It
had a multi-turn wirewound potentiometer in series with the inductor.

--
Cheers,
Richard B. Johnson
Read about my book
http://www.AbominableFirebug.com

 -------------- Original message ----------------------
From: RLO2L at aol.com
>  
> In a message dated 4/6/2007 1:29:50 A.M. Central Daylight Time, 
> Xmitters at aol.com writes:
> 
> Hello:
> 
> I have one of those rare situations where I actually have  access to 
> telco copper from my studio over to my STL center/backup  satellite 
> RO, a mile
and

> a
> half away. Who makes program quality repeat  coils and program 
> equalizers anymor e?
> Tell Labs still  around?
> 
> 
> 
> Jeff:
>  
> Sorry, hit wrong button.
>  
> I can get you commercial coils from a number of the manufacturers. If 
> you don't mind paying the cost, Jensen Transformers make some of the 
> best these

> days.
>  
>  
>  
> Russel L.  O'Toole, P.C.
> R&M Consulting
> 
> 31 Ponderosa  Drive
> Romeoville, Illinois 60446
> 815-372-1990 voice
> 630-699-2965  cell
> 815-886-9232 fax
> KD5OAE General
> 
> 
> 
> ************************************** See what's free at
http://www.aol.com.
> _______________________________________________
> 
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The BROADCAST [BC] list is sponsored by SystemsStore On-Line Sales
Cable-Connectors-Blocks-Racks-Wire Management-Test Gear-Tools and More! 
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